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|
use std::{fmt, rc::Rc};
use crate::{
channel::{ChannelKind, Channels},
parse,
};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ChanSpec {
PulseA,
PulseB,
Triangle,
Noise,
}
impl fmt::Display for ChanSpec {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::PulseA => f.write_str("pulsea"),
Self::PulseB => f.write_str("pulseb"),
Self::Triangle => f.write_str("triangle"),
Self::Noise => f.write_str("noise"),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Instruction {
Pause(u16),
PauseLen(u16),
Jump(u16),
SetVolume(ChanSpec, u8),
SetPitch(ChanSpec, u8),
SetPulseDutyA(u8),
SetPulseDutyB(u8),
SetNoiseMode(bool),
}
impl fmt::Display for Instruction {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Pause(len) => write!(f, "pause {len}"),
Self::PauseLen(len) => write!(f, "pause_len {len}"),
Self::Jump(pc) => write!(f, "jump {pc}"),
Self::SetVolume(chan, v) => write!(f, "{chan} volume {v}"),
Self::SetPitch(chan, p) => write!(f, "{chan} pitch {p}"),
Self::SetPulseDutyA(dc) => write!(f, "{} duty_cycle {dc}", ChanSpec::PulseA),
Self::SetPulseDutyB(dc) => write!(f, "{} duty_cycle {dc}", ChanSpec::PulseB),
Self::SetNoiseMode(mode) => write!(f, "{} mode {mode}", ChanSpec::Noise),
}
}
}
use Instruction as I;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Track {
pub ins: Vec<Instruction>,
}
impl Track {
pub fn parse(src: &str) -> parse::Result<Self> {
let ins = parse::parse(src)?;
Ok(Self { ins })
}
#[must_use]
pub fn merge(&self, other: &Self) -> Self {
let mut res = vec![];
let mut l = 0;
let mut r = 0;
let mut l_pause = 0;
let mut r_pause = 0;
let l_ins = &self.ins;
let r_ins = &other.ins;
loop {
if l >= l_ins.len() && r >= r_ins.len() {
// were done here
break;
}
while l < l_ins.len() {
if l_pause > 0 {
break;
}
let ins = l_ins[l];
l += 1;
if let I::Pause(cnt) = ins {
l_pause = cnt;
break;
}
res.push(ins);
}
while r < r_ins.len() {
if r_pause > 0 {
break;
}
let ins = r_ins[r];
r += 1;
if let I::Pause(cnt) = ins {
r_pause = cnt;
break;
}
res.push(ins);
}
if l_pause > 0 {
if r_pause > 0 && l_pause >= r_pause {
l_pause -= r_pause;
res.push(I::Pause(r_pause));
r_pause = 0;
} else if r_pause == 0 {
res.push(I::Pause(l_pause));
l_pause = 0;
}
}
if r_pause > 0 {
if l_pause > 0 && r_pause >= l_pause {
r_pause -= l_pause;
res.push(I::Pause(l_pause));
l_pause = 0;
} else if l_pause == 0 {
res.push(I::Pause(r_pause));
r_pause = 0;
}
}
}
Self { ins: res }
}
}
impl fmt::Display for Track {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for (idx, ins) in self.ins.iter().enumerate() {
if idx != 0 {
writeln!(f)?;
}
write!(f, "{ins}")?;
}
Ok(())
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Program {
track: Rc<Track>,
priority: u32,
looping: bool,
pc: usize,
pause_cnt: usize,
pause_len: usize,
channels: Channels,
}
impl Program {
pub const fn new(track: Rc<Track>, priority: u32, looping: bool) -> Self {
Self {
track,
priority,
looping,
pc: 0,
pause_cnt: 0,
pause_len: 4,
channels: Channels::new(),
}
}
const fn exec_ins(&mut self, ins: Instruction) {
use Instruction as I;
match ins {
I::Pause(cnt) => {
self.pause_cnt = self.pause_len * (cnt as usize);
}
I::PauseLen(pause_len) => {
self.pause_len = pause_len as usize;
}
I::Jump(pc) => {
self.pc = pc as usize;
}
I::SetVolume(chan_spec, volume) => {
// set the volume (amplitude) on a given channel
use ChanSpec as C;
match chan_spec {
C::PulseA => self.channels.pulse_a.volume = volume,
C::PulseB => self.channels.pulse_b.volume = volume,
C::Triangle => self.channels.triangle.volume = volume,
C::Noise => self.channels.noise.volume = volume,
}
}
I::SetPitch(chan_spec, pitch) => {
// set the pitch (freq) on a given channel
use ChanSpec as C;
match chan_spec {
C::PulseA => self.channels.pulse_a.pitch = pitch,
C::PulseB => self.channels.pulse_b.pitch = pitch,
C::Triangle => self.channels.triangle.pitch = pitch,
C::Noise => self.channels.noise.pitch = pitch,
}
}
I::SetPulseDutyA(dc) => {
if let ChannelKind::Pulse { duty_cycle } = &mut self.channels.pulse_a.kind {
*duty_cycle = dc;
}
}
I::SetPulseDutyB(dc) => {
if let ChannelKind::Pulse { duty_cycle } = &mut self.channels.pulse_b.kind {
*duty_cycle = dc;
}
}
I::SetNoiseMode(m) => {
if let ChannelKind::Noise { mode, .. } = &mut self.channels.noise.kind {
*mode = m;
}
}
}
}
pub fn exec(&mut self) -> Channels {
if self.pause_cnt > 0 {
self.pause_cnt -= 1;
}
loop {
if self.is_finished() {
if self.looping {
self.pc = 0;
} else {
break;
}
}
if self.pause_cnt > 0 {
break;
}
let ins = self.track.ins[self.pc];
self.exec_ins(ins);
self.pc += 1;
}
self.channels
}
pub fn is_finished(&self) -> bool {
self.pc >= self.track.ins.len()
}
}
impl PartialOrd for Program {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl Ord for Program {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.priority.cmp(&other.priority)
}
}
|
